State $\times$ Year Fixed Effects   &   \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark \\
Geoclimatic Controls   &   \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark \\
Smooth Location Controls   &   \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark \\
Railroad:   &   &   &   &   &   &   &   \\
\ \ \ \ In county   &   &   \checkmark & \checkmark & \checkmark & \checkmark & \checkmark & \checkmark \\
\ \ \ \ Within 10 miles   &   &   &   \checkmark & \checkmark & \checkmark & \checkmark & \checkmark \\
\ \ \ \ Within 20 miles   &   &   &   &   \checkmark & \checkmark & \checkmark & \checkmark \\
\ \ \ \ Within 30 miles   &   &   &   &   &   \checkmark & \checkmark & \checkmark \\
\ \ \ \ Within 40 miles   &   &   &   &   &   &   \checkmark & \checkmark \\
\ \ \ \ Within 50 miles   &   &   &   &   &   &   &   \checkmark \\
